/**
 * ============================================================================
 * LOADER.CSS - SPIDER LOADING SCREEN & SPLIT-WALL GATE ANIMATION
 * ============================================================================
 * Dual-Door Wall Split System:
 * When loading completes, the screen splits vertically down the center.
 * The left wall carries the left half of the spider, and the right wall carries
 * the right half of the spider as both doors slide open smoothly to reveal content.
 */

/* -------------------------------------------------------------------------- */
/* 1. SPLIT-WALL GATE CONTAINER & DUAL DOORS                                  */
/* -------------------------------------------------------------------------- */
.gate-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 999999;
    pointer-events: none;
    overflow: hidden;
    perspective: 1200px;
    -webkit-perspective: 1200px;
}

/* Individual Door Panels (Left Wall: 0-50%, Right Wall: 50-100%) */
.gate-door {
    position: absolute;
    top: 0;
    width: 50vw;
    height: 100vh;
    overflow: hidden;
    background: var(--bg-primary);
    will-change: transform;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    transform: translate3d(0, 0, 0);
    /* Hydraulic Closing Curve (Swift start, soft pneumatic cushion) */
    transition: transform 0.72s cubic-bezier(0.32, 0.72, 0, 1), box-shadow 0.5s ease;
    box-shadow: none; /* No shadow when closed - 100% seamless unbroken canvas */
    border: none;
}

.gate-door.left-door {
    left: 0;
    transform: translateX(0);
}

.gate-door.right-door {
    left: 50vw;
    right: auto;
    transform: translateX(0);
}

/* Canvases inside doors: Full-width rendering with 50% clipping per door */
.door-canvas {
    position: absolute;
    top: 0;
    width: 100vw !important;
    height: 100vh !important;
    pointer-events: none;
    background: transparent;
}

.door-canvas.left-canvas {
    left: 0;
}

.door-canvas.right-canvas {
    left: -50vw; /* Shifts canvas by 50vw so the right half aligns seamlessly with right-door */
}

/* ========================================================================= */
/* KINETIC LASER SEAM CUTTER SYSTEM (Black Precision Slicing)                */
/* ========================================================================= */
.gate-center-seam {
    position: absolute;
    top: 0;
    left: calc(50vw - 1px);
    width: 2px;
    height: 100vh;
    z-index: 1000000;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s;
}

/* Base Laser Beam Channel */
.seam-laser-beam {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100vh;
    background: #14151e;
    box-shadow: 0 0 10px rgba(20, 21, 30, 0.4), 0 0 2px rgba(0, 0, 0, 0.9);
    transform: scaleY(0);
    transform-origin: center;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Traveling Spark Cutters (Burst outward from Spider Center at 50%) */
.seam-spark-head {
    position: absolute;
    left: -4px;
    width: 10px;
    height: 10px;
    background: #ffffff;
    border: 2px solid #14151e;
    border-radius: 50%;
    box-shadow: 0 0 12px rgba(20, 21, 30, 0.8), 0 0 4px #ffffff;
    opacity: 0;
    transform: scale(0);
    transition: top 0.5s cubic-bezier(0.16, 1, 0.3, 1), bottom 0.5s cubic-bezier(0.16, 1, 0.3, 1), transform 0.25s ease, opacity 0.25s ease;
}

.seam-spark-head.top-cutter {
    top: 50vh;
}

.seam-spark-head.bottom-cutter {
    bottom: 50vh;
}

/* Monospace HUD Indicators at Top and Bottom */
.seam-indicator {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: #14151e;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    padding: 3px 8px;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    opacity: 0;
    transition: opacity 0.3s ease 0.18s, transform 0.35s cubic-bezier(0.16, 1, 0.3, 1) 0.18s;
}

.seam-indicator.top-indicator {
    top: 24px;
    transform: translateX(-50%) translateY(-8px);
}

.seam-indicator.bottom-indicator {
    bottom: 24px;
    transform: translateX(-50%) translateY(8px);
}

/* ========================================================================= */
/* PULSE SEAM ACTIVE STATE (Spark Heads Slice Outward)                       */
/* ========================================================================= */
.gate-container.pulse-seam .gate-center-seam {
    opacity: 1;
    visibility: visible;
}

.gate-container.pulse-seam .seam-laser-beam {
    transform: scaleY(1);
}

.gate-container.pulse-seam .seam-spark-head.top-cutter {
    top: 0vh;
    opacity: 1;
    transform: scale(1);
}

.gate-container.pulse-seam .seam-spark-head.bottom-cutter {
    bottom: 0vh;
    opacity: 1;
    transform: scale(1);
}

.gate-container.pulse-seam .seam-indicator {
    opacity: 1;
}

.gate-container.pulse-seam .seam-indicator.top-indicator {
    transform: translateX(-50%) translateY(0);
}

.gate-container.pulse-seam .seam-indicator.bottom-indicator {
    transform: translateX(-50%) translateY(0);
}

/* Mechanical Unlatch Nudge (2px pressure release before wide open) */
.gate-container.unlatched .gate-door.left-door {
    transform: translateX(-3px);
}

.gate-container.unlatched .gate-door.right-door {
    transform: translateX(3px);
}

/* ========================================================================= */
/* OPEN DOORS STATE: Left Wall -> Left, Right Wall -> Right                  */
/* ========================================================================= */
.gate-container.open-doors .gate-door {
    /* Expansive Pneumatic Glide Outward */
    transition: transform 0.96s cubic-bezier(0.16, 1, 0.28, 1), box-shadow 0.6s ease;
}

.gate-container.open-doors .gate-door.left-door {
    transform: translate3d(-100%, 0, 0);
    box-shadow: 8px 0 35px rgba(0, 0, 0, 0.14);
}

.gate-container.open-doors .gate-door.right-door {
    transform: translate3d(100%, 0, 0);
    box-shadow: -8px 0 35px rgba(0, 0, 0, 0.14);
}

.gate-container.open-doors .gate-center-seam {
    opacity: 0;
    visibility: hidden;
}

/* -------------------------------------------------------------------------- */
/* 2. LOADER OVERLAY HUD & BUTTONS                                            */
/* -------------------------------------------------------------------------- */
.loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 999998;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 24px 32px;
    background: transparent;
    opacity: 1;
    visibility: visible;
    pointer-events: none; /* Allows canvas pass-through */
    transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.loader-overlay.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    z-index: 35;
    pointer-events: auto;
}

.loader-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--text-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-spider);
    border-radius: 50%;
    box-shadow: 0 0 6px var(--accent-spider-glow);
    animation: pulseDot 1.4s ease-in-out infinite alternate;
}

@keyframes pulseDot {
    0% { transform: scale(0.8); opacity: 0.7; }
    100% { transform: scale(1.25); opacity: 1; }
}

/* Skip Button */
.skip-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-primary);
    background: #ffffff;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: all var(--transition-fast);
}

.skip-btn:hover {
    background: var(--accent-spider);
    color: #ffffff;
    border-color: var(--accent-spider);
    box-shadow: 0 4px 14px var(--accent-spider-glow);
    transform: translateY(-1px);
}

.skip-key {
    font-size: 0.7rem;
    padding: 2px 6px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    color: var(--text-secondary);
}

.skip-btn:hover .skip-key {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff;
    border-color: transparent;
}

.loader-center-stage {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 100%;
}

.spider-stage-anchor {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* -------------------------------------------------------------------------- */
/* 3. RESPONSIVE QUERIES                                                      */
/* -------------------------------------------------------------------------- */
@media (max-width: 600px) {
    .loader-overlay {
        padding: 16px;
    }
}